[Q] Sensation XL Runnymead + ClockworkMod Recovery

I just bought a preowned HTC Sensation XL with Cyanogen Runnymead Android 4.2.2 Jellybean operating system and it seems the Cyanogen system is interfering with some of the phones functions.
1. Some outgoing phone calls suffer from a loud whistling noise.
2. When turning off the phone and plugging in a charger.... the phone reawakes, stops charging and implements clockworkmod recovery menu, of which I have no understanding.
3. The phone is unable to recognise the contact list from a sim card.

How can I simply and easily restore the phone safely to stock Android 2.3.5?

I just bought a preowned HTC Sensation XL with Cyanogen Runnymead Android 4.2.2 Jellybean operating system and it seems the Cyanogen system is interfering with some of the phones functions.
1. Some outgoing phone calls suffer from a loud whistling noise.
2. When turning off the phone and plugging in a charger.... the phone reawakes, stops charging and implements clockworkmod recovery menu, of which I have no understanding.
3. The phone is unable to recognise the contact list from a sim card.

How can I simply and easily restore the phone safely to stock Android 2.3.5?

2nd is a downloader thing. Mine does it aswell I don't know about the others sorry

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